Severe negative camber can wear the inside of the tire, but it's a mistake to think even for a second that we are talking about some kind of independent factors in isolation. I've had 1.5 negative camber on both cars for years with perfectly smooth and even wear on both front and rear tires. So my use case argues against negative camber of a moderate sort being a big chewer up of tires. On the other hand when we've had toe problems the tires go quickly and it's always chewing up the inside tread. Which is part of what makes people blame the camber. But again this is misinformed. We're not talking about 5° here nobody's running that, even people tracking the car are at 2.5 to 3 degrees negative. And they're actually seeing pretty even wear because of how heavily loaded the outside edges of the tires are on the track@dfwatt That may be true, but camber alone absolutely can cause that, and @robl45 already said they got the toe aligned after lowering.
Seeing the actual alignment numbers would be good to confirm, but are you actually suggesting the static camber with those lowering springs isn't enough to cause this in 20k miles?
In my experience (on a different car but similar tires width if that matters) even -1.5° rear camber is enough to cord the inside before the tread is otherwise done on a purely street-driven car (no track miles). It certainly won't happen as quickly as having toe really off, but @robl45 said that wear took 20k miles, that checks out to me.
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